#CalStatistics.py
def getNum():          #获取用户不同长度的输入
    nums = []
    iNumStr = input("请输入数字（回车退出）：")
    while iNumStr != "":
        nums.append(eval(iNumStr))
        iNumStr = input("请输入数字（回车退出）：")
    return nums
def mean(numbers):     #计算平均值
    s = 0.0
    for num in numbers:
        s = s + num
    return s / len(numbers)
def dev(numbers,mean): #计算方差
    t = 0.0
    for num in numbers:
        t = t + (num-mean)**2
    return pow(t/len(numbers),0.5)
def median(numbers):   #计算中位数
    sorted(numbers)
    size = len(numbers)
    if size % 2 == 0:
        med = (numbers[size//2-1]+numbers[size//2])/2
    else:
        med = numbers[size//2]
    return med
n = getNum()
m = median(n)
print("平均值：{}，方差：{}，中位数：{}.".format(m,dev(n,m),median(n)))
